JP4324514B2 - Fuel delivery pipe - Google Patents

Description

  The present invention relates to a fuel delivery pipe for supplying fuel supplied from a fuel pressurizing pump of an electronic fuel injection type automobile engine to each intake passage of the engine via an injection nozzle. The purpose is to reduce radiated sound.

JP 2000-329030 A JP 2000-320422 A JP 2000-329031 A Japanese Patent Laid-Open No. 11-37380 Japanese Patent Laid-Open No. 11-2164 JP-A-60-240867 JP-A-10-331743

  2. Description of the Related Art Conventionally, there is known a fuel delivery pipe that is provided with a plurality of injection nozzles and supplies fuel such as gasoline to a plurality of cylinders of an engine. This fuel delivery pipe injects fuel introduced from a fuel tank through an underfloor pipe into a plurality of intake pipes or cylinders of an engine sequentially from a plurality of injection nozzles, and mixes this fuel with air. The engine output is generated by burning the fuel.

  This fuel delivery pipe has a return type that has a circuit that returns the extra fuel to the fuel tank by a pressure regulator when extra fuel is supplied from the fuel tank, and a circuit that returns the extra fuel to the fuel tank. There is no returnless type. Recently, returnless fuel delivery pipes are often used for the purpose of reducing costs and preventing an increase in gasoline temperature in a fuel tank.

  This returnless type fuel delivery pipe has no piping to return excess fuel to the fuel tank, so if the inside of the fuel delivery pipe is depressurized by fuel injection from the engine intake pipe or the injection nozzle to the cylinder, Pressure waves generated by sudden pressure reduction and stop of fuel injection cause pressure pulsation inside the fuel delivery pipe. This pressure pulsation is propagated from the fuel delivery pipe and the connecting pipe connected to the fuel delivery pipe to the fuel tank side, then reversed and returned from the pressure regulating valve in the fuel tank, and then the fuel delivery pipe is connected via the connecting pipe. Is propagated to. The fuel delivery pipe is provided with a plurality of injection nozzles, and the plurality of injection nozzles sequentially inject fuel to generate pressure pulsation. As a result, the underfloor piping is propagated as noise into the vehicle through the clip that holds the underfloor pipe under the floor, and this noise causes discomfort to the driver and the rider.

  Conventionally, as a method of suppressing such harmful effects caused by pressure pulsation, a pulsation damper containing a rubber diaphragm is placed in a returnless type fuel delivery pipe, and the generated pressure pulsation energy is absorbed by this pulsation damper. If the underfloor pipe located under the floor from the fuel delivery pipe to the fuel tank side is fixed to the underfloor via a vibration absorbing clip, this occurs in the fuel delivery pipe or underfloor pipe to the tank. Absorbing vibration is done. These methods are relatively effective and have the effect of suppressing the adverse effects caused by the occurrence of pressure pulsation.

  In addition, as in the inventions shown in Patent Document 1 to Patent Document 6, for the purpose of reducing pressure pulsation, a fuel delivery pipe having a pulsation absorbing function capable of absorbing pressure pulsation has been proposed. Fuel delivery pipes with these pressure pulsation absorbing functions form a flexible absorber surface on the outer wall of the fuel delivery pipe, and the pressure generated by the fuel injection causes the absorber surface to bend and deform. Absorbs and reduces pulsation, making it possible to prevent the generation of noise due to the vibration of fuel delivery pipes and other parts.

  However, pulsation dampers and vibration-absorbing clips are expensive, increasing the number of parts and increasing costs, and creating new problems in securing installation space. On the other hand, in the conventional techniques shown in Patent Document 1 to Patent Document 6, there is an effect of absorbing pressure pulsation, but it occurs when the spool of the injection nozzle is seated on a valve seat or the like with the opening and closing of the injection nozzle during fuel injection. There is a problem that a sound with a high frequency of several kHz or more, such as a ticking sound, is amplified by the absorber surface and radiated to the outside.

  In order to reduce this radiated sound, in Patent Document 7, the surface rigidity of the opposing wall surface is increased by a method such as providing a bead on the wall surface facing the wall surface provided with the injection nozzle or joining a circular pipe. Because of this high surface rigidity, when pressure pulsation occurs in the fuel delivery, the fuel delivery pipe is prevented from being greatly bent by this pulsation, and it is tried to suppress high-frequency sound from being radiated. It was.

  However, in the method of providing a bead on the wall surface, it is technically difficult to adjust so that the sound on the high frequency side does not radiate while having the flexibility to suppress the pressure pulsation of the fluid. . Further, when the circular pipes are joined to the planar wall surface, the mutual contact becomes a line contact, and the joining stability is poor. On the contrary, there is a possibility that the high frequency sound will reverberate in the circular pipe. Therefore, the present invention can reduce pressure pulsation during combustion injection by the injection nozzle, prevent generation of vibration and noise in the underfloor piping, and can reduce radiation sound from the fuel delivery pipe body, and The purpose is to provide a compact fuel delivery pipe with a high degree of freedom in the layout of installation at a low price with simple manufacturing technology.

Since the present invention is to solve such problems described above, the first invention connects the fuel inlet pipe to the return-less type fuel delivery pipe body return circuit to a fuel tank provided with a jetting nozzle is not provided, In the fuel delivery pipe connected to the fuel tank via the underfloor pipe, the fuel introduction pipe is a flexible absorber wall surface of at least one wall surface of the fuel delivery pipe body, and the inner peripheral surface of the absorber wall surface is parallel to the tube axis direction of the fuel delivery pipe body, and fixed by at least one collision set the rib, the rib, formed heights at opposite portions of the socket with connecting and fixing the long on the inner peripheral surface of Absorb wall To increase the effect of preventing the generation of radiated sound, and by reducing the rib height at the non-opposing part of the socket, It does not interfere with the deflection of Zorb wall, but to increase the absorption effect of the pressure pulsation.

  According to a second aspect of the present invention, a fuel introduction pipe is connected to a main body of a returnless type fuel delivery pipe provided with an injection nozzle and not provided with a return circuit to the fuel tank, and the fuel introduction pipe is connected via an underfloor pipe. In the fuel delivery pipe connected to the fuel tank, at least one wall surface of the fuel delivery pipe body is a flexible absorber wall surface, and the inner circumferential surface of the absorber wall surface is parallel to the tube axis direction of the fuel delivery pipe body. At least one rib protrudes and is fixed, and at least one rib protrudes from the wall surface provided with the socket.

  According to a third aspect of the present invention, a fuel introduction pipe is connected to a main body of a returnless type fuel delivery pipe that is provided with an injection nozzle and is not provided with a return circuit to the fuel tank. In the fuel delivery pipe connected to the fuel tank, at least one wall surface of the fuel delivery pipe body is a flexible absorber wall surface, and the inner circumferential surface of the absorber wall surface is parallel to the tube axis direction of the fuel delivery pipe body. The rib is projected and fixed, and this rib is formed integrally with the fuel delivery pipe body by roll forming a single metal plate, and the both sides of the metal plate at the center of the absorber wall Bend inwardly of the pipe body, make the opposing surface of this protrusion come into surface contact with the inner peripheral surface of the absorber wall surface The ribs of its length the same length is obtained by one form.

  Further, the rib may be formed separately from the fuel delivery pipe body and connected and fixed to the fuel delivery pipe body.

  Further, the rib may be formed integrally with the fuel delivery pipe body.

  Further, the ribs may be arranged in a row at the axial center of the absorber wall surface.

  Further, the ribs may be arranged in a single row or in a plurality of rows in parallel with each other at a position separated from the central portion in the axial direction of the absorber wall surface.

  The rib may have a length that is 1/2 to 1 of the entire length of the absorber wall surface.

  Further, the ribs may be formed to be shorter than the wall surface of the absorber, and one or a plurality of ribs may be disposed in the coaxial direction with a space therebetween.

  Further, the rib may have a formation height> a formation width.

  The present invention is configured as described above, and the pressure pulsation generated inside the fuel delivery pipe due to the fuel injection from the injection nozzle and the injection stop can only be effectively reduced by the deformation and deformation of the wall surface of the absorber. Instead, the ribs disposed on the wall surface of the absorber can suppress the deformation of the wall surface of the absorber against high frequency sound. Accordingly, it is possible to suppress the high-frequency sound such as a ticking sound generated when the spool of the injection nozzle is seated on the valve seat or the like from being radiated to the outside.

  Furthermore, since the rib protrudes from the inner peripheral surface or the outer peripheral surface of the absorber wall surface, it is possible to make surface contact with the absorber wall surface in the contact area corresponding to the thickness of the rib. Therefore, the connection stability of the rib to the absorber wall surface is enhanced, and the effect of reducing the radiated sound can be maintained. In addition, since only ribs are provided on the wall surface of the absorber, the manufacturing technique is easy and the manufacturing cost can be reduced. In particular, by providing ribs on the inner peripheral surface of the absorber wall surface, the fuel delivery pipe does not become excessively bulky, and it is possible to install the fuel delivery pipe even in a limited space, with a high degree of freedom in layout. It becomes. Further, it is not necessary to use a pulsation damper, a vibration absorbing clip, or the like for the underfloor piping, so that the cost of the entire product can be reduced and the flexibility of the layout of the underfloor piping can be improved.

  In the first aspect of the invention, the height of the rib is increased at the facing portion of the socket to increase the effect of preventing the generation of radiated sound, and the height of the rib is decreased at the non-facing portion of the socket. This makes it possible to enhance the absorption effect of pressure pulsation without hindering the bending of the absorber wall surface against pressure pulsation.

  In the second invention, since at least one rib protrudes from the wall surface provided with the socket, the surface rigidity of one wall surface to which the socket is attached is increased, and the high frequency from the one wall surface is increased. It is possible to suppress sound radiation to a small level.

  In the third invention, the rib is formed by roll-molding a single metal plate and integrally formed with the fuel delivery pipe body, and both sides of the metal plate are formed at the center of the absorber wall surface at the fuel delivery. Since the pipe body is bent inward and protruded, and the opposing surface of this protrusion is in surface contact, one rib having the same length as the entire length can be formed on the inner peripheral surface of the absorber wall surface. It becomes possible.

Hereinafter, embodiments of the fuel delivery pipe of the present invention will be described in detail with reference to the drawings. The embodiment shown in FIGS. 1 to 3 is an embodiment in which a rib provided separately from the fuel delivery pipe main body is connected and fixed to the absorber wall surface by brazing, welding or the like. The embodiment shown in FIG. 4 is a fuel delivery pipe. This is an embodiment in which a rib is provided integrally with the fuel delivery pipe main body at the stage of sheet metal pressing or roll forming of the main body. Then, FIG. 1 is a sectional view of the tube axis perpendicular of the fuel delivery pipe of Example 1, thereby butt set the ribs on the inner peripheral surface of Absorb wall. Figure 2 is a cross-sectional view in the length direction of the fuel delivery pipe of the different embodiments, to butt set a long rib on the inner peripheral surface of Absorb wall higher to form a formed height of the rib in the opposing portion of the socket, In the non-facing portion of the socket, the rib formation height is low, and a continuous height difference is provided in the rib formation height. FIG. 3 is a cross-sectional view of the fuel delivery pipe of a different embodiment in which ribs are provided on the inner peripheral surface of the absorber wall surface in a direction perpendicular to the tube axis. Thus, a fuel delivery pipe body having a rectangular cross section is formed.

  FIG. 4 is a cross-sectional view of a fuel delivery pipe of a different embodiment in a direction perpendicular to the tube axis. When forming a fuel delivery pipe body by roll forming a metal plate, both side edges of the metal plate are located at the center of the absorber wall surface. The long ribs are integrally provided on the inner peripheral surface of the inner peripheral surface, and the socket is spaced from the central portion so as not to interfere with the ribs.

  The first embodiment of the present invention will be described in detail with reference to FIG. 1. (1) is a fuel delivery pipe body, which is formed by roll molding, sheet metal press molding or the like, and a pair of end walls (8) and the end walls. It is composed of a pair of straight wall surfaces (2) provided between the walls (8) and a pair of arc-shaped side walls (3) connecting both ends of the pair of straight wall surfaces (2). This is a flat tube having an oval cross-sectional shape. In addition, a plurality of sockets (4) are provided on one straight wall surface (2) to connect injection nozzles (not shown). For example, in the case of a four-cylinder engine, four sockets (4) are provided. In the case of an in-line 6-cylinder engine, six sockets (4) are provided at a desired interval and angle.

  The fuel delivery pipe main body (1) is connected to a fuel introduction pipe (not shown) at one end, and this fuel introduction pipe is connected to a fuel tank (not shown) via an underfloor pipe (not shown). Has been. The fuel in the fuel tank is transferred to the fuel introduction pipe via the underfloor pipe, flows from the fuel introduction pipe to the fuel delivery pipe body (1), and is injected into the engine via the injection nozzle connected to the socket (4). The fuel is directly injected into the intake passage or the cylinder. Further, most of the fuel delivery pipe main body (1) is provided with a bracket (not shown) for connecting and fixing the fuel delivery pipe main body (1) to the engine main body on the attachment side of the socket (4).

  Then, the other straight wall surface (2) not provided with the socket (4) is formed so as to be able to bend and deform by the pulsation of the fluid, thereby forming an elastic wall surface (5) having flexibility. Further, a plate-like rib (6) is connected and fixed by brazing or welding to the axial center of the outer peripheral surface of the absorber wall surface (5) in parallel with the pipe axis direction of the fuel delivery pipe body (1). is doing. The rib (6) is formed by connecting and fixing one side of a long metal plate to the absorber wall surface (5) by surface contact, and can be arranged from one end of the absorber wall (5) to the other end. Measured. The rib (6) is formed at the same height from one end to the other end.

  In the first embodiment and other different embodiments described below, the rib (6) preferably has a thickness of 0.5 to 2.5 mm. If the thickness is less than 0.5 mm, the effect of reducing radiated sound is poor, and if it is thicker than 2.5 mm, the effect of reducing pressure pulsation is poor. Furthermore, the rib (6) preferably has a formation height of 3 to 12 mm. If the formation height is lower than 3 mm, the effect of reducing radiated sound becomes poor. Further, even if the height is higher than 12 mm, there is no significant difference in the reduction effect of the radiated sound. Particularly when the rib (6) is provided on the outer peripheral surface of the absorber wall surface (5), the fuel delivery pipe body (1) is bulky. As a result, the degree of freedom in layout decreases.

  As described above, by projecting the rib (6) on the inner peripheral surface of the absorber wall surface (5), the absorber wall surface (5) can be bent with respect to pressure pulsation or the like. The surface of the absorber wall (5) can be given surface rigidity that does not resonate. The rib (6) has one side surface of a long metal plate connected and fixed to the absorber wall surface (5) by surface contact, and the width of the brazing material or melted metal fillet (7) is equal to each other. Since the contact area increases, it is possible to improve the connection fixing property of the rib (6) to the absorber wall surface (5). Therefore, the effect of suppressing the high-frequency sound radiation of the absorber wall surface (5) by providing the rib (6) can be maintained for a long time.

  In addition, since the plate-like rib (6) is simply connected and fixed to the absorber wall surface (5) by brazing or welding, it is not necessary to use advanced manufacturing techniques or expensive materials, and the fuel delivery pipe can be used. You can get it cheaply.

  In the fuel delivery pipe as described above, the inside of the fuel delivery pipe body (1) is suddenly depressurized by the fuel injection from the intake pipe of the engine or the injection nozzle to the cylinder, or the pressure wave is generated by stopping the fuel injection. When pressure pulsation occurs inside the delivery pipe body (1), the wall surface of the absorber (5) is bent and deformed to change the internal volume. This pressure pulsation is absorbed and the transmission and propagation of pressure pulsation and noise are suppressed. Is done.

  On the other hand, if a high-frequency sound of several kHz or more, such as a ticking sound generated when the spool of the injection nozzle is seated on a valve seat or the like after fuel injection, a rib (6) is provided to project this high-frequency sound. As a result, the bending of the absorber wall surface (5) is suppressed, so that the radiation of high-frequency sound to the outside can be reduced.

  Further, as described above, the rib (6) may be connected and fixed to only one long rib (6). However, the rib (6) may be separated from one end at a position separated from the axial center of the absorber wall surface (5). Two long ribs (6) made of a metal plate having the same formation height to the end may be connected and fixed by brazing or welding in parallel with the tube axis direction. In this way, by using two ribs (6), it is possible to exert a bending suppression effect on high-frequency sound in a well-balanced manner over the entire absorber wall surface (5).

  Further, as described above, the rib (6) may be connected and fixed by brazing or welding a plurality of short ribs (6) over the entire length of the absorber wall surface (5). A short rib (6) made of a metal plate and having a constant formation height may be connected and fixed only at two locations near one end and near the other end of the central portion in the axial direction of the absorber wall surface (5). Even such a fuel delivery pipe absorbs pressure pulsation by the absorber wall surface (5) and can suppress the radiated sound, and a cheaper and less bulky product can be obtained.

  In addition, as described above, the rib (6) may project only from the wall surface (5) of the absorber (5) to which the socket (4) is not attached, but one of the straights to which the socket (4) is attached. A rib (6) may be provided on the wall surface (2). A total of three long ribs (6) are connected and fixed to the absorber wall surface (5) by brazing or welding at intervals in the center in the axial direction and on both sides thereof. Then, on one straight wall surface (2) to which the socket (4) is attached, two long ribs (6) are connected and fixed in parallel to the tube axis direction at a position separated from the central portion in the axial direction. At the same time, short ribs (6) are connected and fixed between the plurality of sockets (4). By adopting such a configuration, the surface rigidity of one straight wall surface (2) to which the socket (4) is attached is increased, and the radiation of high-frequency sound from this one straight wall surface (2) can be suppressed to a small level. It becomes possible. In this embodiment, both the short and long ribs (6) are made of a metal plate and have a constant formation height.

  The ribs are connected and fixed to the inner peripheral surface of the absorber wall surface (5) by brazing or welding, including the above embodiments. In this way, by arranging the rib (6) inside the fuel delivery pipe main body (1), the bulk of the fuel delivery pipe main body (1) can be reduced and installation in a narrow space is also possible. Thus, the degree of freedom of layout is increased. Also in this case, the pressure pulsation can be absorbed by the bending of the absorber wall surface (5), and the radiation of high frequency sound to the outside can be suppressed by the rib (6).

  The ribs may be formed at the same height from one end to the other, but may have a height difference in the height of the rib (6). For this purpose, the vicinity of both ends in the length direction of the rib (6) is cut obliquely to provide a pair of inclined portions (10), and the formation heights on both end sides are gradually lowered. Except for the pair of inclined portions (10), the rib (6) is formed at the same formation height.

  Thus, by increasing the formation height of the rib (6) on the center side of the fuel delivery pipe body (1), the surface rigidity in the vicinity of the center where the radiated sound is easily amplified due to the bending of the absorber wall surface (5) is increased. Thus, it is possible to obtain a good reduction effect of the radiated sound. In addition, the cost can be reduced by reducing the amount of metal plate used, the product can be made lighter and more compact, can be installed in a smaller space, and the degree of freedom in layout is improved. Become. Even if there is a height difference in the formation height of the rib (6), the rib (6) is formed with the lowest formation height of 3 mm or more and the formation height of the highest height with 12 mm or less. It is preferable to do this.

  When the height of the rib (6) is provided with a height difference, the height of the rib (6) in the center in the longitudinal direction is set to the highest, and the one end side and the other end side from this center The formation height may be gradually lowered to provide a pair of inclined portions (10). Even with such a configuration, the surface rigidity of the center side of the absorber wall surface (5) is increased, and an excellent effect of reducing radiated sound can be obtained, and the deflection of the absorber wall surface (5) for absorbing pressure pulsation can be reduced. There is no hindrance, and a good pressure pulsation reduction effect can be obtained.

  Further, the high frequency sound generated by the injection nozzle sitting on the valve seat or the like is easily amplified on the wall surface of the facing portion of the socket (4) to which the injection nozzle is connected. Therefore, on the outer peripheral surface of the absorber wall surface (5), the short ribs (6) may be connected and fixed to the facing portions of the socket (4). By arranging such ribs (6), the bending of the absorber wall (5) at the facing portion of the socket (4) when high frequency sound is generated is suppressed, and high frequency sound is radiated to the outside. It can be suppressed efficiently.

  Further, in the embodiment shown in FIG. 2, a long rib (6) is connected and fixed to the inner peripheral surface of the absorber wall surface (5), and this rib (6) is formed at the facing portion of the socket (4). Deflection of the absorber wall surface (5) against pressure pulsation by increasing the height to increase the effect of preventing the generation of radiated sound and by reducing the formation height of the rib (6) at the non-opposing portion of the socket (4) The pressure pulsation absorption effect is enhanced. And the opposing part and non-opposing part of the socket (4) of the rib (6) are connected by the inclined part (10).

  In each of the above embodiments, the fuel delivery pipe main body (1) is a flat tube having an oval cross-sectional shape. However, as another different embodiment, the fuel may be a flat tube having an oval or rectangular cross-sectional shape. The delivery pipe body (1) may be formed, or a pipe that is not a flat pipe having a square cross section may be used. Moreover, you may use the pipe of other different arbitrary shapes which combined the straight wall surface (2) and the curved surface.

  The embodiment shown in FIG. 3 is an embodiment of the fuel delivery pipe body (1) having a rectangular cross-sectional shape. In this embodiment, a pair of box-shaped metal plates having a U-shaped cross section are combined. A fuel delivery pipe body (1) is formed. The rib (6) is connected and fixed to the inner peripheral surface of the absorber wall surface (5) of the fuel delivery pipe body (1). With this configuration, the ribs (6) are connected and fixed to the inner peripheral surface of the absorber wall surface (5), and then both side walls (3) of a pair of metal plates having a U-shaped cross section are brazed to each other. It can be connected and fixed by welding. Accordingly, it becomes easy to dispose the rib (6) in the fuel delivery pipe main body (1), and it becomes easy to manufacture the fuel delivery pipe.

  In each of the above embodiments, only the other straight wall surface (2) to which the socket (4) is not attached is a flexible absorber wall surface (5), but one straight wall surface to which the socket (4) is attached. (2) and / or one side wall (3) and / or the other side wall (3) may be an absorber wall surface (5), and ribs (6) may be provided on these walls.

  Further, the rib (6) may be connected and fixed to the inner peripheral surface of the fuel delivery pipe body (1) by brazing, welding or the like, with the rib (6) formed separately from the fuel delivery pipe body (1). The fuel delivery pipe main body (1) and the rib (6) are integrally formed when the fuel delivery pipe main body (1) is molded. For this purpose, when forming a fuel delivery pipe body (1) by roll forming a single metal plate, both side edges of the metal plate are placed at the center of the absorber wall (5), and both side edges are centered. The fuel delivery pipe body (1) is bent outward and protruded, and the opposing surfaces of the protrusion are brought into surface contact, and the bent portions are connected and fixed by brazing, welding, or the like. One long rib (6) having the same total length as the wall surface (5) is formed.

  Further, end plates (8) may be formed by attaching end plates to both ends of the fuel delivery pipe body (1) provided with the rib (6). In the first embodiment shown in FIG. 1 and the like, an end plate (8) may be formed by attaching an end plate, or a metal plate having the same shape as the inner surface of the fuel delivery pipe body (1) is fitted. The end wall (8) may be formed by welding or brazing.

  As described above, when the fuel delivery pipe body (1) is formed, the rib (6) is integrally formed using a single metal plate, so that it is easier to connect and fix the rib (6). Thus, low-cost manufacturing is possible, and the connection strength between the rib (6) and the fuel delivery pipe body (1) is high, and the durability and thermal conductivity are improved.

  Further, the rib (6) is preferably formed so that the relation between the formation height and the formation width of the cross section in the direction perpendicular to the tube axis is such that the formation height> the formation width. This is because, if the formation width of the rib (6) is equal to or greater than the formation height, it is considered that the wall surface (5) of the absorber becomes difficult to bend even for pressure pulsation and the like, and the effect of reducing pressure pulsation is reduced. Moreover, although the formation length of the axial direction of the rib (6) is the same length as the absorber wall surface (5), it may be shorter than this. However, the formation length of the rib (6) is preferably 1/2 to 1 of the absorber wall surface (5), and if the length is shorter than 1/2, the rib (6) has a length relative to the absorber wall surface (5). If the ratio is too small, the effect of reducing radiated sound is reduced. Further, if the length of the rib (6) is longer than the length of the absorber wall surface (5), the material is wasted and bulky in the axial direction, resulting in poor layout.

  Further, in the embodiment shown in FIG. 4, a single metal plate is roll-formed to form a rib (6) integrally with the fuel delivery pipe body (1). At the center of (5), the fuel delivery pipe body (1) is bent inward and protruded, and the opposing surface of this protrusion is brought into surface contact with the inner peripheral surface of the absorber wall (5). One rib (6) having the same length as the entire length is formed. In this case, the fuel delivery pipe body (1) and the rib (6) can be easily manufactured by omitting the connection and fixing work, and the fuel delivery pipe body (1) is less bulky in the height direction. The layout can be set up in a narrow space and the degree of freedom in layout is high.

  Furthermore, in this embodiment, the position where the socket (4) is separated from the central portion so as not to cause a problem such as contact between the rib (6) projecting from the central portion on the inner peripheral surface and the socket (4). Connected so that they do not interfere with each other. Of course, in the fuel delivery pipe body (1), the gap between the absorber wall surface (5) where the rib (6) is provided and the straight wall surface (2) where the socket (4) is provided is sufficiently wide. If there is no possibility of interference with the socket (4), both the rib (6) and the socket (4) may be provided in the central portion.

  The rib (6) has two rows of ribs that are long in the axial direction by attaching both side edges of the metal plate formed in a box shape by roll forming and the flat metal plate to each other on the side of the absorber wall surface (5). (6) may be provided on the inner peripheral surface of the absorber wall surface (5). Further, three or more rows of ribs (6) may be provided, or the ribs (6) are provided on the inner peripheral surface of the absorber wall surface (5) with both side edges of the flat metal plate facing the inner surface. Also good. Thus, by providing a plurality of rows of ribs (6) in the width direction, it is possible to exert a bending suppression effect on high-frequency sound in a well-balanced manner over the entire absorber wall surface (5).

Sectional drawing of the pipe axis perpendicular direction of the fuel delivery pipe of Example 1 of this invention. Sectional drawing of the length direction of the fuel delivery pipe of the Example from which this invention differs differs. Sectional drawing of the pipe axis orthogonal direction of the different fuel delivery pipe of this invention. Sectional drawing of the pipe axis orthogonal direction of the different fuel delivery pipe of this invention.

1 Fuel delivery pipe body 4 Socket 5 Absorb wall surface 6 Rib

Claims (10)

A fuel delivery pipe connected to a fuel tank via an underfloor pipe and a fuel introduction pipe connected to a returnless type fuel delivery pipe main body provided with an injection nozzle and not provided with a return circuit to the fuel tank at a, at least one wall of the fuel delivery pipe body and a flexible Absorb wall, the inner peripheral surface of the Absorb wall, parallel to the tube axis direction of the fuel delivery pipe body, is at least one collision set the ribs solid constant Te, the ribs, by increasing the formation height in the opposing portion of the socket with the connection fixed to elongate the inner peripheral surface of Absorb wall, enhance the effect of preventing occurrence of radiation noise, non-facing socket By reducing the rib formation height at the part, the effect of absorbing pressure pulsation is enhanced without hindering the bending of the absorber wall against pressure pulsation. Fuel delivery pipe characterized by things. A fuel delivery pipe connected to a fuel tank via an underfloor pipe and a fuel introduction pipe connected to a returnless type fuel delivery pipe main body provided with an injection nozzle and not provided with a return circuit to the fuel tank at a, at least one wall of the fuel delivery pipe body and a flexible Absorb wall, the inner peripheral surface of the Absorb wall, parallel to the tube axis direction of the fuel delivery pipe body, is at least one collision set the ribs Te solid with a constant, the fuel delivery pipe, characterized in that was also at least one projecting rib on the wall provided with the socket. A fuel delivery pipe connected to a fuel tank via an underfloor pipe and a fuel introduction pipe connected to a returnless type fuel delivery pipe main body provided with an injection nozzle and not provided with a return circuit to the fuel tank In this case, at least one wall surface of the fuel delivery pipe body is a flexible absorber wall surface, and ribs are provided on the inner peripheral surface of the absorber wall surface in parallel with the tube axis direction of the fuel delivery pipe body. This rib is formed integrally with the fuel delivery pipe body by roll-molding a single metal plate, and both side edges of the metal plate are folded inward of the fuel delivery pipe body at the center of the absorber wall surface. Bending and projecting, with the opposing surface of this projecting part in surface contact, the inner wall surface of the absorber wall has the same length as its entire length. Fuel delivery pipe, characterized in that the one forming the ribs. 4. The fuel delivery pipe according to claim 1 , wherein the rib is formed separately from the fuel delivery pipe main body and is connected and fixed to the fuel delivery pipe main body. 4. The fuel delivery pipe according to claim 1 , wherein the rib is formed integrally with the fuel delivery pipe main body. 6. The fuel delivery pipe according to claim 1, 2, 3, 4 or 5, wherein the ribs are arranged in a line at a central portion in the axial direction of the absorber wall surface. The fuel delivery pipe according to claim 1, 2, 3, 4 or 5, wherein the ribs are arranged in a row or in a plurality of rows in parallel with each other at a position spaced apart from the central portion in the axial direction of the absorber wall surface. The fuel delivery pipe according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the rib has a length which is 1/2 to 1 of a total length of the absorber wall surface. The fuel delivery according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the rib is formed shorter than the wall surface of the absorber, and one or a plurality of ribs are arranged in the coaxial direction with a space therebetween. pipe. 10. The fuel delivery pipe according to claim 1 , wherein the formation height of the rib is greater than the formation width.

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